Col de la Machine

What to Expect on the Col de la Machine

The Col de la Machine is a Category 1 climb in France, running 10.7 km from bottom to top with an average gradient of 7.39%. Starting from 243 m elevation, the road gains 1,207 m of total ascent before reaching the summit at 1,032 m. Those numbers alone mark this as a serious effort — but the headline statistic is the maximum gradient of 45.96%, which belongs to a different category of suffering entirely.

To put that in context: a 45.96% ramp is barely rideable for most cyclists, even at near-zero speed. It's the kind of pitch that can stop a rider dead if they arrive at it without the right gear or without sufficient momentum.

How the Gradient Unfolds

With 1,207 m of total ascent over 10.7 km, the road averages 7.39% — steady, sustained, and demanding. That average is high enough to require disciplined pacing from the first kilometer. But the gap between the average (7.39%) and maximum (45.96%) gradients tells you the climb is not uniform. The road has a split personality: long sections of consistent grinding are punctuated by at least one ramp that is categorically harder than anything the average suggests.

Key gradient zones to anticipate:

• Lower slopes: The start at 243 m puts you well below the summit. Expect the opening kilometres to set the tone — any early respite is borrowed time.
• Mid-section: The average gradient across the full 10.7 km means the middle portion is working hard. There is no flat section where you genuinely recover.
• Maximum pitch ramp: The 45.96% spike will be localised, but it demands respect. Arrive at it with too high a gear or too little energy and the climb ends on your terms, not yours.

Pacing Strategy

Because the average gradient is 7.39% over more than 10 km, this is fundamentally a threshold effort. Going out hard and soft-pedalling the steep ramp later is not a viable plan — the 45.96% section will extract a penalty regardless. The more durable approach:

1. Set a sustainable power ceiling early. Anything much above your FTP on the opening 3–4 km will compound fatigue by the time the road kicks hardest.
2. Accept the ramp for what it is. The extreme maximum gradient is likely short in duration but extreme in intensity. Shift down before you reach it. Trying to power through in a big gear risks stalling or blowing up your legs for the remainder.
3. Don't treat the summit as the finish line too early. With 10.7 km on the clock, the summit is a long way off from the base. Manage effort in thirds rather than halves.

Not sure where your threshold sits before attempting this? Use the FTP estimator to set realistic power targets before the day.

Gearing Notes

The 45.96% maximum gradient is the governing factor for gear selection. Whatever compact or mid-compact chainset you're running, the lowest gear available is the right gear for that ramp. A 34/32 or 34/34 combination is not excessive here — it's sensible. Riders on 50/34 with an 11-28 cassette should seriously reconsider that setup before attempting this climb. There is no shame in spinning slowly at 45.96%; there is significant regret in grinding to a halt.

For reference on comparable Category 1 climbs and how gearing decisions play out on steep French roads, see the Alpe d'Huez profile — though the Machine's maximum pitch exceeds anything you'll find on that more famous ascent.

Summary

The Col de la Machine rewards patience, punishes ego, and demands proper low gearing for its extreme upper ramps. At 7.39% average over 10.7 km, it is long enough to drain reserves well before the hardest sections arrive. Respect the numbers and plan accordingly.